Abstract
The cycloisomerization of enynes can be performed with a variety of catalytic systems which operate according to various types of activation process. Metal catalysts showing different activation abilities can promote as the first step either oxidative coupling, triple bond insertion into metal-hydride bond, allylic activation, electrophilic activation, metal–vinylidene formation, and [2+2]-cycloaddi tion (metathesis). Depending on the nature of the enyne and the catalytic system, all these processes lead to a variety of cyclic compounds.
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